Note 7 - Debt - Schedule of Debt (Details) (Parentheticals) - Notes Payable to Banks [Member]	9 Months Ended	12 Months Ended
Sep. 30, 2023	Dec. 31, 2022
Fixed Rate Notes, Mortgage Debt [Member]
Interest rate	4.97%	4.97%
Maturity date	Oct. 01, 2023	Oct. 01, 2023
Debt Instrument, Interest Rate, Stated Percentage	4.97%	4.97%
Debt Instrument, Maturity Date	Oct. 01, 2023	Oct. 01, 2023
Fixed Rate Notes, Financed Insurance Premium [Member]
Interest rate	6.94%	6.94%
Maturity date	Dec. 19, 2022	Dec. 19, 2022
Debt Instrument, Interest Rate, Stated Percentage	6.94%	6.94%
Debt Instrument, Maturity Date	Dec. 19, 2022	Dec. 19, 2022

Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
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-Topic 210
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-Topic 820
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-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
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-Name Accounting Standards Codification
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-Topic 470
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-Name Accounting Standards Codification
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-Publisher FASB
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